448591661 has 4 divisors (see below), whose sum is σ = 512676192. Its totient is φ = 384507132.

The previous prime is 448591603. The next prime is 448591679. The reversal of 448591661 is 166195844.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 448591661 - 2¹⁸ = 448329517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (448591361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32042255 + ... + 32042268.

It is an arithmetic number, because the mean of its divisors is an integer number (128169048).

Almost surely, 2^448591661 is an apocalyptic number.

It is an amenable number.

448591661 is a deficient number, since it is larger than the sum of its proper divisors (64084531).

448591661 is an equidigital number, since it uses as much as digits as its factorization.

448591661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64084530.

The product of its digits is 207360, while the sum is 44.

The square root of 448591661 is about 21179.9825542893. The cubic root of 448591661 is about 765.5091721843.

The spelling of 448591661 in words is "four hundred forty-eight million, five hundred ninety-one thousand, six hundred sixty-one".